Refer to the accompanying graph. If this firm is a price taker, then when the price of each unit of output is $$30,$ how much profit does this firm earn at its profit$-$maximizing level of output?

The graph plots quantity versus cost in dollars. Three curves marked M C$,$ A T C and A V are shown in the graph.

Select one:

a$.$ $$800$

b$.$ $$1,200$

c$.$ $$1,600$

d$.$ $$500$